Finding the Fourth Proportional to 2,279.28, 3,145.03 and 1,284.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.28 : 3,145.03 = 1,284.55 : x
2. Step 2: Convert to fraction form
   2,279.28/3,145.03 = 1,284.55/x
3. Step 3: Cross multiply
   2,279.28x = 3,145.03 × 1,284.55
4. Step 4: Simplify right side
   2,279.28x = 4,039,948.29
5. Step 5: Solve for x
   x = 4,039,948.29/2,279.28
6. Step 6: Final answer
   x = 1,772.47